Add unittests of ArcCustomNotificationView

ui/arc/notification/arc_custom_notification_view.cc

Index: ui/arc/notification/arc_custom_notification_view.cc
diff --git a/ui/arc/notification/arc_custom_notification_view.cc b/ui/arc/notification/arc_custom_notification_view.cc
index b622f420755237ce93700d03a26ce68e2073049f..f21b2714dbd4f3dbc0b086c6d1bf619db65ee669 100644
--- a/ui/arc/notification/arc_custom_notification_view.cc
+++ b/ui/arc/notification/arc_custom_notification_view.cc
@@ -200,8 +200,11 @@ class ArcCustomNotificationView::ControlButton
   ArcCustomNotificationView* const owner_;
 };
 
-ArcCustomNotificationView::ArcCustomNotificationView(
-    ArcCustomNotificationItem* item)
+// static
+const char ArcCustomNotificationView::kViewClassName[] =
+    "ArcCustomNotificationView";
+
+ArcCustomNotificationView::ArcCustomNotificationView(ArcNotificationItem* item)
     : item_(item),
       notification_key_(item->notification_key()),
       event_forwarder_(new EventForwarder(this)) {
@@ -210,11 +213,13 @@ ArcCustomNotificationView::ArcCustomNotificationView(
   item_->IncrementWindowRefCount();
   item_->AddObserver(this);
 
-  ArcNotificationSurfaceManager::Get()->AddObserver(this);
-  exo::NotificationSurface* surface =
-      ArcNotificationSurfaceManager::Get()->GetSurface(notification_key_);
-  if (surface)
-    OnNotificationSurfaceAdded(surface);
+  if (ArcNotificationSurfaceManager::Get()) {
+    ArcNotificationSurfaceManager::Get()->AddObserver(this);
+    exo::NotificationSurface* surface =
+        ArcNotificationSurfaceManager::Get()->GetSurface(notification_key_);
+    if (surface)
+      OnNotificationSurfaceAdded(surface);
+  }
 
   // Create a layer as an anchor to insert surface copy during a slide.
   SetPaintToLayer();
@@ -232,6 +237,10 @@ ArcCustomNotificationView::~ArcCustomNotificationView() {
     ArcNotificationSurfaceManager::Get()->RemoveObserver(this);
 }
 
+const char* ArcCustomNotificationView::GetClassName() const {
+  return kViewClassName;
+}
+
 std::unique_ptr<message_center::CustomNotificationContentViewDelegate>
 ArcCustomNotificationView::CreateContentViewDelegate() {
   return base::MakeUnique<ArcCustomNotificationView::ContentViewDelegate>(this);
@@ -366,7 +375,7 @@ void ArcCustomNotificationView::AttachSurface() {
     return;
 
   UpdatePreferredSize();
-  Attach(surface_->window());
+  surface_->AttachWindow(this);
 
   // The texture for this window can be placed at subpixel position
   // with fractional scale factor. Force to align it at the pixel